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Description
Technical Specifications
| Product Model | 1768-M04SE |
|---|---|
| Manufacturer | Rockwell Automation / Allen‑Bradley |
| Product Type | SERCOS Interface Motion Control Module for CompactLogix 1768 Series |
| Number of Axes Supported | Up to 4 axes per module (multiple modules permitted per system) |
| Communication Protocol | SERCOS Interface (IEC 61491) – Class 1/Class 2, 2 Mbps or 4 Mbps selectable |
| Fiber Optic Ports | 2 × ST‑type connectors (SERCOS IN and SERCOS OUT) for ring topology |
| Backplane Current Draw | 969 mA max @ 5.2 V DC |
| Module Location Requirement | Must be within 2 slots of the 1768 power supply; typically adjacent to or one slot from CPU |
| Indicators | Module Status (MS), SERCOS Link Status, Axis Status per configured axis |
| Servo Update Time | Configurable; typical 0.5 ms – 2 ms depending on axes and SERCOS phase |
| Compatible Drives | Kinetix 6000, Kinetix 7000, Ultra 3000 in SERCOS mode, and other IEC 61491‑compliant drives |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
| Storage Temperature | –40 °C to 85 °C |
| Relative Humidity | 5% to 95% non‑condensing |
| Mounting | 1768 CompactLogix chassis / DIN‑rail mounted rack |
| Dimensions (H×W×D) | Approx. 138 × 34 × 117 mm (5.43 × 1.34 × 4.61 in) |
| Certifications | UL, cUL, CE, C‑Tick, FM Class I Div 2, RoHS |
Main Features and Advantages
Deterministic SERCOS motion networking: The 1768‑M04SE uses industry‑standard SERCOS IEC 61491 fiber‑optic communication to exchange position commands, actual feedback, drive status, and I/O data in hard real time. The optical link provides total galvanic isolation from drive power grounds and eliminates susceptibility to EMI from VFDs, welders, or high‑current contactors—a critical advantage in multi‑drive coordinated motion systems. The 1768‑M04SE supports both 2 Mbps and 4 Mbps SERCOS baud rates, allowing optimization of network bandwidth versus cable length.Integrated Logix motion instruction set: All motion programming is done through the native Logix motion instructions (MAM – Move Absolute, MAG – Move Gear, MAS – Stop Motion, CAM – Cam Profile, etc.) within RSLogix 5000 / Studio 5000. No separate motion controller or proprietary motion language is required. Axis objects, tuning screens, and oscilloscope‑style trending are built into the software, and the 1768‑M04SE makes all servo parameters available as controller tags for seamless HMI display and data logging.Four‑axis control in a single slot: A single 1768‑M04SE module controls up to four synchronized servo or stepper axes, with support for coordinated motion groups, homing routines, software travel limits, and error‑response handling per axis. For machines requiring more than four axes, additional 1768‑M04SE modules can be added to the same CompactLogix rack, each managing its own SERCOS ring while sharing the same controller program and tag database.Compact footprint with simplified wiring: Because drive command and feedback travel over the SERCOS fiber pair rather than individual analog ±10 V or step/direction wiring, panel space and field wiring are dramatically reduced. The 1768‑M04SE requires only the fiber patch cords to the first drive and a properly terminated SERCOS ring; encoder feedback returns digitally through the same network. Diagnostics such as loss‑of‑link, drive faults, and axis following‑error are reported through module LEDs and controller status bits, accelerating fault isolation during commissioning and production.Backplane integration and configuration ease: The 1768‑M04SE is detected automatically when added to the I/O configuration tree in RSLogix 5000. The engineer selects the attached drive types, assigns axis names, and sets SERCOS phase timing; the software handles node addressing and parameter mapping. Firmware compatibility checking between the 1768‑M04SE, the CompactLogix CPU, and connected Kinetix drives is enforced to prevent mismatched revisions that could affect motion performance.
Application Field
The 1768‑M04SE is deployed wherever compact, cost‑effective, yet high‑performance coordinated motion is required under the CompactLogix architecture. In vertical‑form‑fill‑seal (VFFS) and horizontal flow‑wrappers, the module synchronizes product infeed, film feed, cross‑seal, and cutoff knives across multiple servo axes to maintain registration at high line speeds. Cartoning machines and case packers use the 1768‑M04SE to coordinate pick‑and‑place robot arms, conveyor indexing, and flap‑folding stations with electronic cam profiles that can be changed on‑the‑fly for different product sizes.Converting lines—such as roll‑to‑roll coaters, slitter‑rewinders, and label presses—benefit from the electronic line‑shafting capability of the 1768‑M04SE, replacing mechanical line shafts with digitally coupled master/follower axes that reduce mechanical wear and allow ratio adjustments via HMI. Assembly test stands and precision dispensing equipment leverage the module’s high‑resolution position loop closure and fast servo update times to achieve repeatable, micron‑level accuracy.Retrofit projects migrating from standalone motion controllers or relay‑based sequencing to an integrated Logix platform frequently specify the 1768‑M04SE because it preserves existing SERCOS‑capable Kinetix or Ultra 3000 drives while consolidating logic, I/O, and motion into one CompactLogix CPU. By doing so, machine builders reduce panel components, standardize programming practices, and gain remote diagnostics previously unavailable with discrete motion hardware. The 1768‑M04SE thus serves as the enabling interface between Rockwell’s flagship small‑to‑mid‑range PAC platform and its intelligent drive ecosystem.
Related Products
- 1768‑L43 — CompactLogix 1768 CPU with 2 serial ports and Ethernet option; the most common controller paired with the 1768‑M04SE for 4‑axis SERCOS motion applications.
- 1768‑L45 — Higher‑memory CompactLogix 1768 CPU (8 MB user memory) for larger programs and additional motion axes when used with one or more 1768‑M04SE modules.
- 1768‑L42 — Entry‑level CompactLogix 1768 CPU; supports the 1768‑M04SE for smaller machines requiring basic coordinated motion.
- 1768‑ENBT — EtherNet/IP communication module for the 1768 chassis; often added alongside the 1768‑M04SE to provide HMI, SCADA, or peer‑controller messaging.
- 1768‑PA3 — 100–240 V AC / 24 V DC input power supply for 1768 chassis; recommended to be within 2 slots of the 1768‑M04SE due to its backplane current draw.
- 1768‑PB3 — 24 V DC nominal power supply for 1768 chassis; alternative to the PA3 depending on panel power availability.
- 2094‑K Series (Kinetix 6000) — SERCOS‑capable integrated servo drive/amplifier family most commonly connected to the 1768‑M04SE via fiber‑optic SERCOS ring.
- 1398‑DSD‑xxx (Ultra 3000 in SERCOS mode) — Digital servo drive with SERCOS interface; legacy but still supported when interfaced through the 1768‑M04SE.
- 1769‑HSC — High‑speed counter module for the smaller 1769 (MicroLogix / CompactLogix 5370) platform; mentioned for contrast—true SERCOS motion requires the 1768‑M04SE on the 1768 chassis.
